[GitHub/mt8127/android_kernel_alcatel_ttab.git] / Documentation / nfc / nfc-pn544.txt

Kernel driver for the NXP Semiconductors PN544 Near Field
Communication chip

General
-------

The PN544 is an integrated transmission module for contactless
communication. The driver goes under drives/nfc/ and is compiled as a
module named "pn544".

Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.

Protocols
---------

In the normal (HCI) mode and in the firmware update mode read and
write functions behave a bit differently because the message formats
or the protocols are different.

In the normal (HCI) mode the protocol used is derived from the ETSI
HCI specification. The firmware is updated using a specific protocol,
which is different from HCI.

HCI messages consist of an eight bit header and the message body. The
header contains the message length. Maximum size for an HCI message is
33. In HCI mode sent messages are tested for a correct
checksum. Firmware update messages have the length in the second (MSB)
and third (LSB) bytes of the message. The maximum FW message length is
1024 bytes.

For the ETSI HCI specification see
http://www.etsi.org/WebSite/Technologies/ProtocolSpecification.aspx
Commit	Line	Data
0329326e MA	1	Kernel driver for the NXP Semiconductors PN544 Near Field
	2	Communication chip
	3
0329326e MA	4	General
	5	-------
	6
	7	The PN544 is an integrated transmission module for contactless
	8	communication. The driver goes under drives/nfc/ and is compiled as a
1353a10c	9	module named "pn544".
0329326e MA	10
	11	Host Interfaces: I2C, SPI and HSU, this driver supports currently only I2C.
	12
0329326e MA	13	Protocols
	14	---------
	15
	16	In the normal (HCI) mode and in the firmware update mode read and
	17	write functions behave a bit differently because the message formats
	18	or the protocols are different.
	19
	20	In the normal (HCI) mode the protocol used is derived from the ETSI
	21	HCI specification. The firmware is updated using a specific protocol,
	22	which is different from HCI.
	23
	24	HCI messages consist of an eight bit header and the message body. The
	25	header contains the message length. Maximum size for an HCI message is
	26	33. In HCI mode sent messages are tested for a correct
	27	checksum. Firmware update messages have the length in the second (MSB)
	28	and third (LSB) bytes of the message. The maximum FW message length is
	29	1024 bytes.
	30
	31	For the ETSI HCI specification see
	32	http://www.etsi.org/WebSite/Technologies/ProtocolSpecification.aspx